CN113043035A

CN113043035A - Positioning fixture for machining

Info

Publication number: CN113043035A
Application number: CN202110346758.0A
Authority: CN
Inventors: 郑小慧; 郝芳; 田亚丁; 吴秋梅; 杨秋平
Original assignee: Xinxiang Vocational and Technical College
Current assignee: Xinxiang Vocational and Technical College
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-06-29
Anticipated expiration: 2041-03-31
Also published as: CN113043035B

Abstract

The invention provides a positioning fixture for machining, which belongs to the technical field of machining and comprises a turntable, wherein a plurality of clamping blocks are arranged on one side of the turntable, and a driving assembly for driving the clamping blocks to synchronously move along the diameter direction of the turntable is arranged in the turntable; the drive assembly includes actuating lever and a plurality of driven lever, actuating lever and a plurality of driven lever all distribute along carousel diameter direction, and actuating lever one end extends to the carousel outside, is provided with first screw thread section on the actuating lever, is provided with the second screw thread section on a plurality of driven lever, equal thread bush is equipped with the sliding sleeve in first screw thread section and the second screw thread section, a plurality of first spouts have been seted up to carousel one side. In the embodiment of the invention, the driving rod, the driving gear, the annular rack, the driven rod and the driven gear are arranged, so that the synchronous movement of the plurality of clamping blocks can be realized to clamp and position the workpiece.

Description

Positioning fixture for machining

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a positioning clamp for machining.

Background

Machining refers to a process of changing the physical dimensions or properties of a workpiece by a mechanical device. The difference in the machining method can be divided into cutting machining and pressing machining. Turning, milling, drilling, boring, planing and the like are common in cutting machining.

At present, when turning a workpiece, the workpiece needs to be clamped and fixed by using a clamping mechanism, the structure of the conventional clamping mechanism is complex, the clamping effect on the workpiece is poor, and the workpiece is easy to loosen in the machining process, so that the machining efficiency is influenced.

Disclosure of Invention

In view of the defects in the prior art, an embodiment of the present invention provides a positioning fixture for machining.

In order to solve the technical problems, the invention provides the following technical scheme:

a positioning clamp for machining comprises a rotary table, wherein a plurality of clamping blocks are arranged on one side of the rotary table, and a driving assembly for driving the clamping blocks to synchronously move along the diameter direction of the rotary table is arranged in the rotary table; the driving assembly comprises a driving rod and a plurality of driven rods, the driving rod and the driven rods are distributed along the diameter direction of the rotary table, one end of the driving rod extends to the outside of the rotary table, a first thread section is arranged on the driving rod, a second thread section is arranged on the driven rods, sliding sleeves are respectively sleeved on the first thread section and the second thread section in a threaded manner, a plurality of first sliding grooves are formed in one side of the rotary table, the driving rod is correspondingly arranged below one group of first sliding grooves, the driven rods are correspondingly arranged below the rest of the first sliding grooves, first connecting rods are fixedly arranged on the upper portions of the sliding sleeves, and the first connecting rods extend from the corresponding first sliding grooves to the outside of the rotary table and are fixedly connected with corresponding clamping blocks; the rotary table is internally and rotatably provided with an annular rack, the driving rod is fixedly provided with a driving gear meshed with the annular rack, and the driven rod is fixedly provided with a driven gear meshed with the annular rack.

As a further improvement of the invention: the inside of the rotary disc is also provided with a non-return assembly for limiting the reverse rotation of the driving rod; the non return subassembly is in including fixed backup pad and the fixed setting that sets up in the inboard bottom of carousel backup pad one side vertical interval distribution's tooth piece, the inside cavity of actuating lever, and the inside activity of actuating lever is provided with the pull rod, pull rod one end extends to actuating lever outside and fixedly connected with handle, the outside cover of actuating lever is equipped with the sleeve, the articulated a plurality of spacing pieces that are provided with of sleeve outer wall, every group spacing piece all distributes along sleeve tangential direction, and all links to each other through the elastomer between spacing piece of every group and the sleeve, the second spout has been seted up to the actuating lever lateral wall, the fixed gag lever post that is provided with of pull rod outer wall, the gag lever post certainly the second spout extend to the actuating lever outside and with sleeve inner wall fixed connection, spacing piece can be embedded into.

As a further improvement of the invention: the elastic body is a spring.

As a further improvement of the invention: the clamping blocks are at least provided with three groups, and the clamping blocks can form an equilateral triangle structure.

As a still further improvement of the invention: the end part of one end of the driving rod, which is positioned inside the turntable, is rotatably connected with the inner wall of the turntable through a first bearing, and one end of the driven rod is rotatably connected with the inner wall of the turntable through a second bearing.

As a still further improvement of the invention: and a rubber anti-slip layer is further arranged on one side of the clamping block.

As a still further improvement of the invention: the sliding sleeve is fixedly provided with a second connecting rod at the bottom, a sliding block is fixedly arranged at the bottom of the second connecting rod, and a guide rail in sliding fit with the sliding block is installed at the bottom of the inner side of the turntable.

Compared with the prior art, the invention has the beneficial effects that:

in the embodiment of the invention, the driving rod, the driving gear, the annular rack, the driven rod and the driven gear are arranged, so that the synchronous movement of the plurality of clamping blocks can be realized to clamp and position the workpiece.

Drawings

FIG. 1 is a schematic structural view of a positioning jig for machining;

FIG. 2 is an internal view of a positioning fixture for machining;

FIG. 3 is a schematic view of a check assembly in a positioning fixture for machining;

FIG. 4 is a partial schematic view of a drive assembly in a positioning fixture for machining;

FIG. 5 is an enlarged view of area A in FIG. 2;

FIG. 6 is an enlarged view of the area B in FIG. 3;

in the figure: 1-rotating disc, 2-first sliding groove, 3-clamping block, 4-handle, 5-driving rod, 6-annular rack, 7-driving gear, 8-sliding sleeve, 9-first thread section, 10-driven rod, 11-second thread section, 12-second bearing, 13-driven gear, 14-first bearing, 15-second sliding groove, 16-sleeve, 17-limiting piece, 18-elastic body, 19-tooth piece, 20-supporting plate, 21-first connecting rod, 22-second connecting rod and 23-sliding block.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Example 1

Referring to fig. 1-6, the present embodiment provides a positioning fixture for machining, including a turntable 1, a plurality of clamping blocks 3 are disposed on one side of the turntable 1, a driving assembly for driving the clamping blocks 3 to synchronously move along a diameter direction of the turntable 1 is disposed inside the turntable 1, specifically, the driving assembly includes a driving rod 5 and a plurality of driven rods 10, the driving rod 5 and the plurality of driven rods 10 are both distributed along the diameter direction of the turntable 1, one end of the driving rod 5 extends to an outside of the turntable 1, a first thread section 9 is disposed on the driving rod 5, a second thread section 11 is disposed on the plurality of driven rods 10, a sliding sleeve 8 is respectively threaded on both the first thread section 9 and the second thread section 11, a plurality of first sliding grooves 2 are disposed on one side of the turntable 1, the driving rod 5 is correspondingly disposed below one group of the first sliding grooves 2, and the plurality of driven rods 10 are correspondingly disposed below the other first sliding grooves 2, a first connecting rod 21 is fixedly arranged at the upper part of the sliding sleeve 8, and the first connecting rod 21 extends from the corresponding first sliding chute 2 to the outside of the turntable 1 and is fixedly connected with the corresponding clamping block 3; the rotary table is characterized in that an annular rack 6 is rotatably arranged inside the rotary table 1, a driving gear 7 meshed with the annular rack 6 is fixedly arranged on the driving rod 5, and a driven gear 13 meshed with the annular rack 6 is fixedly arranged on the driven rod 10.

During the use, the work piece that will treat the centre gripping is arranged in 1 one side of carousel, the one end of guaranteeing the work piece is located 3 intermediate positions of a plurality of grip blocks, rotate actuating lever 5, actuating lever 5 drives the sliding sleeve 8 on its upper portion and removes, and then drive the grip block 3 that corresponds through first connecting rod 21 and remove to 1 central direction of carousel, actuating lever 5 still can drive gear 7 when rotating and rotate, drive annular rack 6 through the meshing of drive gear 7 with ring tooth rack 6 and rotate, utilize the meshing of annular rack 6 and driven gear 13 to drive a plurality of driven levers 10 and rotate, and then sliding sleeve 8 on the driven lever 10 removes, in order to drive all the other grip blocks 3 to 1 central position synchronous motion of carousel, thereby carry out the centre gripping to the one end of work piece.

Further, 1 inside still being provided with of carousel is used for the restriction 5 antiport's of actuating lever non return subassembly, it is concrete, the non return subassembly is including fixed backup pad 20 and the fixed setting that sets up in 1 inboard bottom of carousel 20 one side vertical interval distribution's tooth piece 19, the inside cavity of actuating lever 5, and the inside activity of actuating lever 5 is provided with the pull rod, pull rod one end extends to 5 outsides and fixedly connected with handle 4 of actuating lever, the outside cover of actuating lever 5 is equipped with sleeve 16, the articulated a plurality of spacing pieces 17 that are provided with of sleeve 16 outer wall, every group spacing piece 17 all distributes along sleeve 16 tangential direction, and all links to each other through elastomer 18 between spacing piece 17 of every group and the sleeve 16, second spout 15 has been seted up to 5 lateral walls of actuating lever, the gag lever certainly second spout 15 extend to 5 outsides and with sleeve 16 inner wall fixed connection to actuating lever The limiting plate 17 can be embedded between the two sets of tooth plates 19.

When the driving rod 5 is rotated to drive the clamping blocks 3 to move towards the center of the turntable 1, the driving rod 5, the pull rod and the sleeve 16 synchronously rotate, the sleeve 16 drives the limiting pieces 17 to rotate, so that the limiting pieces 17 are sequentially embedded between the two groups of tooth pieces 19, and the limiting pieces 17 are arranged along the tangential direction of the sleeve 16, so that a non-return structure is formed between the limiting pieces 17 and the tooth pieces 19, thereby preventing a workpiece from loosening in the clamping process and ensuring the stability of clamping of the workpiece; after the workpiece is machined, the pull rod can be pulled outwards, the pull rod drives the sleeve 16 to move along the length direction of the driving rod 5 through the limiting rod, so that the limiting piece 17 is pulled away from one side of the tooth piece 19, the driving rod 5 is rotated reversely at the moment, the clamping blocks 3 are driven to synchronously move towards the edge of the rotary table 1, and the clamping state of the workpiece is relieved.

Specifically, the elastic body 18 is a spring.

In this embodiment, at least three groups of the clamping blocks 3 are provided, and the three groups of the clamping blocks 3 can form an equilateral triangle structure.

In this embodiment, the end portion of the driving rod 5 located inside the rotary table 1 is rotatably connected to the inner wall of the rotary table 1 through a first bearing 14, and one end of the driven rod 10 is rotatably connected to the inner wall of the rotary table 1 through a second bearing 12.

In this embodiment, a rubber anti-slip layer (not shown) is further disposed on one side of the clamping block 3 to improve the friction force between the clamping block and the workpiece, so as to improve the clamping effect on the workpiece.

Example 2

Referring to fig. 4, in the present embodiment, compared with embodiment 1, a second connecting rod 22 is fixedly disposed at the bottom of the sliding sleeve 8, a sliding block 23 is fixedly disposed at the bottom of the second connecting rod 22, and a guide rail (not shown) slidably engaged with the sliding block 23 is mounted at the bottom of the inner side of the rotary table 1.

Through the sliding fit between the sliding block 23 and the guide rail, the stability of the clamping block 3 in the moving process can be improved.

In the embodiment of the invention, the driving rod 5, the driving gear 7, the annular rack 6, the driven rod 10 and the driven gear 13 are arranged, so that the synchronous movement of the plurality of clamping blocks 3 can be realized to clamp and position the workpiece.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. The positioning clamp for machining is characterized by comprising a rotary table (1), wherein a plurality of clamping blocks (3) are arranged on one side of the rotary table (1), and a driving assembly for driving the clamping blocks (3) to synchronously move along the diameter direction of the rotary table (1) is arranged in the rotary table (1); the driving assembly comprises a driving rod (5) and a plurality of driven rods (10), the driving rod (5) and the driven rods (10) are distributed along the diameter direction of the turntable (1), one end of the driving rod (5) extends to the outside of the turntable (1), a first thread section (9) is arranged on the driving rod (5), a second thread section (11) is arranged on the driven rods (10), a sliding sleeve (8) is sleeved on each of the first thread section (9) and the second thread section (11), a plurality of first sliding chutes (2) are formed in one side of the turntable (1), the driving rod (5) is correspondingly arranged below one group of first sliding chutes (2), the driven rods (10) are correspondingly arranged below the other first sliding chutes (2), a first connecting rod (21) is fixedly arranged on the upper portion of the sliding sleeve (8), and the first connecting rod (21) extends to the outside of the turntable (1) from the corresponding first sliding chute (2) and is fixedly connected with the corresponding clamping block (3); the rotary table is characterized in that an annular rack (6) is arranged in the rotary table (1) in a rotating mode, a driving gear (7) meshed with the annular rack (6) is fixedly arranged on the driving rod (5), and a driven gear (13) meshed with the annular rack (6) is fixedly arranged on the driven rod (10).

2. The positioning jig for machining according to claim 1, characterized in that a check assembly for limiting reverse rotation of the driving rod (5) is further provided inside the rotary table (1); the non-return assembly comprises a supporting plate (20) fixedly arranged at the bottom of the inner side of the turntable (1) and tooth sheets (19) fixedly arranged on one side of the supporting plate (20) and distributed at vertical intervals, the driving rod (5) is hollow inside, a pull rod is movably arranged inside the driving rod (5), one end of the pull rod extends to the outside of the driving rod (5) and is fixedly connected with a handle (4), a sleeve (16) is sleeved outside the driving rod (5), the outer wall of the sleeve (16) is hinged with a plurality of limiting sheets (17), each group of limiting sheets (17) is distributed along the tangential direction of the sleeve (16), each group of limiting sheets (17) is connected with the sleeve (16) through an elastic body (18), a second sliding groove (15) is formed in the side wall of the driving rod (5), a limiting rod is fixedly arranged on the outer wall of the pull rod, and extends from the second sliding groove (15) to the outside of the driving rod (5) and is fixedly connected, the limiting piece (17) can be embedded between the two groups of tooth pieces (19).

3. A positioning jig for machining according to claim 2, characterized in that said elastic body (18) is a spring.

4. The positioning jig for machining according to claim 1, wherein at least three sets of the holding blocks (3) are provided, and the three sets of the holding blocks (3) can form an equilateral triangle structure.

5. A positioning fixture for machining according to any one of claims 1-4, characterized in that the end of the driving rod (5) inside the rotary table (1) is rotatably connected to the inner wall of the rotary table (1) through a first bearing (14), and the end of the driven rod (10) is rotatably connected to the inner wall of the rotary table (1) through a second bearing (12).

6. The positioning fixture for machining according to claim 1, wherein a rubber anti-slip layer is further arranged on one side of the clamping block (3).

7. The positioning fixture for machining according to claim 6, wherein a second connecting rod (22) is fixedly arranged at the bottom of the sliding sleeve (8), a sliding block (23) is fixedly arranged at the bottom of the second connecting rod (22), and a guide rail in sliding fit with the sliding block (23) is installed at the bottom of the inner side of the rotary table (1).